It was just yesterday when we were talking about Millet Note to get Android 6.0 and now we just got a confirmation through another chinese portal about Mi 4 has got Android 6.0.1 Marshmallow update. It did not take too long for Mi 4 to get Android 6.0.1.
According to the source this update is for Mi 4 devices with version MMB29M. This update is of just 100MB. Also with this update you will see that your UI will change and become much smoother.
If you have got this update inform us in the comment below and let us know how does Android 6.0.1 runs in your Mi4.